Check valve



imitarv Nonnrs, Jn., or wns'rrorvr7` MARYLAN1 CHECK VALVE.

Application filed February 4, 1926. Serial No. 85,9614.r``

.This invention relatesy to checkvalvesfor use 1n fluid pressure linesfor preventing the back flow' of the fluid, but permitting the passagetherethrough in one direction as is well known. Y ,l

The primary object of the invention resides in the provision of suchy acheck valve wherein the same may be regulated so as to be opened byfluid under vvarious pressures, and that will not interferewith thelpassage of the fluid therethrough and that will immediately check theflow of the fluid in a reverse direction whenthepressure from the mainline is out olf.y

A further andimportant object is to provide such a check valve whereinthe valve unit per se may be bodily removed from the casing foradjustment, cleaning, repair,-or renewal purposes.` Y

With the` foregoing, and other objects in view as the nature'of theinvention willbe better understood, the same comprises the novel form,combination and arrangementy of parts hereinafter more fully described,shown in the accompanying drawing and claimed.

In the drawing wherein like reference characters indicate correspondingparts throughout the various views:

Figure 1 is a detail vertical section of the valve, and

Figure 2 is a transverse section thereof.

Now having particular referenceI to the drawing, my novel valveconstitutes the pro vision of a casing of suitable shape open` One openend of the at its opposite end. casing 5 is formed with an internalannular shoulder 6 while at` this end said casing is externally screwthreaded as at 7, the vopposite open end of said casing being internallythreaded as at 8. and being formed with an angular shoulder 9 in orderthat said casing may be properly threaded upon the i threaded end of apipe line, (not shown).

Adapted tobe removably ldisposed within the casing 5 isv a'valveunitfconsisting of a cylindrical sleeve 10 that is flanged at itsl upperend as at 11 to enable it to rest upon 'f l I claim as new and desire tosecure by Let-.

the shoulder 6 of the casing 5 in a manner as clearly shown in Figure 1.The bore of kthe upper end of this sleeve 10 is of reduced diameter forprovidinga shoulder 12 that is beveled'so as to function as a valve seatlfor a discl valve 13that is freely movable within a cylinder, beneathsaid shoulder.

This valve disc is formed upon vone end of..

a valve 4stem '14: that is freely lslidable n through a plug 15 threadedwithin the lower end of thesleevel() also as clearly shown"v invFigure 1. Surrounding the stem 14;' between the plug 15 and valve 13 isan expansible coil spring 16 that normally maintains the valve in closedpositionupon the seat, the tension of this spring being adjusted to they proper degree by reason o f the plug-15.

The cylindrical sleeve 10 isformed interymediate the lower end thereofand the seat 'rounded in order to provide a -seatfor a concave annularplate 18 that is'to be secured in position thereon through medium of alocking gland 19 that has threaded engagement` with the upper externallythreaded end of the vcasing 5. Said-plate 18 is formed with a centrallopening from which rises a pipe lsection 2O that is threaded at l itsupper end in order that the `valve may be'properly inserted within thepressure line.y

It will be obviousv that when the valve is y installed, the pressurepassing intothe pipe section'20 and the sleeve 10 will depress the valve13y permitting the fluid to enterV the casing 5 through the slot 17.Immediately upon release of the pressure, the eXpansible spring 16 willcause the valve 13 to close, obviously preventing the back pressurekthrough the sleeve and pipe section 20.

It will thus beseen that I have provided a highly novel, simple, andefficient forml of lcheck valve that is well adapted for all the ythough I have herein shown and described the valve asv applied tocertain detailed structural elements, it is nevertheless to beunderstood that the modifications may be had therein without effectingthe spirit and scope of the appended claim.

f Having thus described the invention, `what ters lPatent is purposesheretofore designated, and even In` ak check valve'. of the\classdescribed, av Y hollow open ended casing adapted to he installedwith a pressure line, an internal anlnularshoulder formed in theupperinlet end of the casing, a removable valve unit' arranged within theAcasing and comprising a oylind'iieel v'sleeve, i ai flange? formed onfthe upper end of the sleeve and sida'pted to rest upon said shoulder,an internal annular-seat formed Within thel sleeve ,-adjaeent vftheflanged upper' end thereof, said sleeve being formed with Huid passageslots beneath' .the

Seat, a. dise Valve slidably arranged within the cylinder beneathftlieSeau springineans fornorniellynlaintaining the dise Valve inpositionkafgain'stthe seat. for pernntting the 4saine ltf1-loe* ppenedunder ,pressure of the fluid entering theyalveunt, means whereby thetension of the Spring;` maybe regulated, the upper end of -the easingand flanged-portlon of -the Sleeve being slightly rounded7 a Con-'carved e-uuualerg plate-Seated thereon, a pipe section extendingupwardly from the annulenplate and provldmg en inlet, and e lock- 111ggland surrounding the annular plate and threaded-enftheperipheral edgeof the flange 20 on the casing.

L ln testimony whereoll l a'iiix my signature.

HENRYfNQRRIS, J 1:. Y

